BUG: scheduling while atomic in kernfs_remove_by_name_ns

Status: premoderation: reported C repro on 2026/07/25 18:52
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+9e67cd70f7f07acd769d@syzkaller.appspotmail.com
First crash: 11d, last: 6h23m
Bug presence (3)
Date Name Commit Repro Result
2026/08/02 android16-6.12 (ToT) 1a138e24e292 C [report] BUG: scheduling while atomic in kernfs_remove
2026/08/02 lts (merge base) 8c9d5557c8e6 C Didn't crash
2026/08/02 upstream (ToT) f5a7e2ae5f0a C Didn't crash
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel NULL pointer dereference in page_fault_oops mm 10 5 707d 715d 0/29 closed as invalid on 2024/09/13 11:13

Sample crash report:
BUG: scheduling while atomic: syz-executor383/321/0x00000002
Modules linked in:
CPU: 0 UID: 0 PID: 321 Comm: syz-executor383 Not tainted syzkaller #0 d75e9a393de9c6a33055d5e25749154d2cb9f431
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 __schedule_bug+0x12b/0x200 kernel/sched/core.c:6626
 schedule_debug kernel/sched/core.c:6653 [inline]
 __schedule+0xb85/0x20b0 kernel/sched/core.c:7697
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 rwsem_down_write_slowpath+0x5c9/0x1b60 kernel/locking/rwsem.c:1239
 __down_write_common kernel/locking/rwsem.c:1383 [inline]
 __down_write kernel/locking/rwsem.c:1392 [inline]
 down_write+0x163/0x2b0 kernel/locking/rwsem.c:1659
 kernfs_remove_by_name_ns+0x8c/0x180 fs/kernfs/dir.c:1737
 kernfs_remove_by_name include/linux/kernfs.h:637 [inline]
 sysfs_unmerge_group+0xd7/0x130 fs/sysfs/group.c:399
 rpm_sysfs_remove drivers/base/power/sysfs.c:826 [inline]
 dpm_sysfs_remove+0x7b/0xd0 drivers/base/power/sysfs.c:835
 device_del+0x241/0xcf0 drivers/base/core.c:3856
 device_unregister drivers/base/core.c:3922 [inline]
 device_destroy+0xb0/0x100 drivers/base/core.c:4521
 android_device_destroy+0x118/0x180 drivers/usb/gadget/android_configfs_uevent.c:223
 gadgets_drop+0x1d/0x30 drivers/usb/gadget/configfs.c:2075
 client_drop_item fs/configfs/dir.c:943 [inline]
 configfs_rmdir+0x8b7/0x9b0 fs/configfs/dir.c:1546
 vfs_rmdir+0x3de/0x560 fs/namei.c:4348
 do_rmdir+0x29a/0x590 fs/namei.c:4407
 __do_sys_rmdir fs/namei.c:4426 [inline]
 __se_sys_rmdir fs/namei.c:4424 [inline]
 __x64_sys_rmdir+0x4b/0x60 fs/namei.c:4424
 x64_sys_call+0xaf7/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:85
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8337d08d19
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee2edffb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8337d08d19
RDX: 0031672f74656764 RSI: a5e06be54067d0be RDI: 0000200000000240
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffee2edffec
R13: 00007ffee2ee0000 R14: 00007ffee2ee0040 R15: 0000000000000006
 </TASK>
BUG: scheduling while atomic: syz-executor383/321/0x00000000
Modules linked in:
CPU: 1 UID: 0 PID: 321 Comm: syz-executor383 Tainted: G        W          syzkaller #0 d75e9a393de9c6a33055d5e25749154d2cb9f431
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 __schedule_bug+0x12b/0x200 kernel/sched/core.c:6626
 schedule_debug kernel/sched/core.c:6653 [inline]
 __schedule+0xb85/0x20b0 kernel/sched/core.c:7697
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 ptrace_stop+0x528/0x8f0 kernel/signal.c:2373
 ptrace_do_notify kernel/signal.c:2410 [inline]
 ptrace_notify+0x1de/0x290 kernel/signal.c:2422
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0x84/0x150 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare+0x21/0x40 kernel/entry/common.c:200
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x15/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8337d08d19
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee2edffb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f8337d08d19
RDX: 0031672f74656764 RSI: a5e06be54067d0be RDI: 0000200000000240
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffee2edffec
R13: 00007ffee2ee0000 R14: 00007ffee2ee0040 R15: 0000000000000006
 </TASK>

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/05 13:26 android16-6.12 f068f96e8cc3 52aa2820 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/03 21:16 android16-6.12 5098494bc7f3 6b7c9f71 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/03 13:52 android16-6.12 5098494bc7f3 6b7c9f71 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/03 11:44 android16-6.12 5098494bc7f3 6b7c9f71 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/01 02:02 android16-6.12 1a138e24e292 7664cf44 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/31 20:23 android16-6.12 1a138e24e292 7664cf44 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/30 22:00 android16-6.12 f1c9c21d1c2f aaffb173 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/25 20:59 android16-6.12 579215f16d4e 492bab15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/03 20:05 android16-6.12 5098494bc7f3 6b7c9f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/03 15:58 android16-6.12 5098494bc7f3 6b7c9f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/02 21:11 android16-6.12 1a138e24e292 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/01 19:26 android16-6.12 1a138e24e292 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/01 14:39 android16-6.12 1a138e24e292 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/08/01 06:08 android16-6.12 1a138e24e292 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/31 12:05 android16-6.12 7d66c8550304 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/30 21:23 android16-6.12 f1c9c21d1c2f aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/27 14:32 android16-6.12 a12ab5a23a35 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
2026/07/25 18:52 android16-6.12 579215f16d4e 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_remove_by_name_ns
* Struck through repros no longer work on HEAD.